Add me to the list of people requesting this!
Just started looking into stencyl, and right away it is unusable on a high dpi screen under Windows 10.
I've got a dual monitor setup: the main monitor is a 3K screen/ The secondary is a 1080P monitor. On some programs I can at least drag over to the 1080P screen, but that does not work for Stencyl. So basically, it cannot be used.
The attached image is only a small cropped region, but you can see what happens relative to the menu options at the top.